In railway tracks, a small gap is left between the rails ?
Correct answer: C. To allow for the expansion during heat
- A. To permit the shrinkage of metal
- B. To save the cost of metal
- C. To allow for the expansion during heat
- D. None of them
Explanation
Railway gaps provide room for metal rails to expand in hot weather; without them, expansion could bend or buckle the track. The gaps are therefore related to heat expansion, not saving material.
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Inventions and Discoveries covers the people, dates, principles and practical uses behind developments such as the wheel, printing press, telephone, electricity, radio, computer, internet, vaccines and space technology. It distinguishes an invention, which creates a device or process, from a discovery, which identifies something already present in nature.
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